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Review reviewHigh

CVE-2021-47240

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and skb_put_data(skb, data + hdrlen, size); will read out of bound from data, which is hdrlen allocated block.

CVSS
7.1
EPSS
0.24%
15.0% percentile
CISA KEV
Not listed
Published
2024.05.22
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.24%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: qrtr: fix OOB Read in qrtr_endpoint_post Syzbot reported slab-out-of-bounds Read in qrtr_endpoint_post. The problem was in wrong _size_ type: if (len != ALIGN(size, 4) + hdrlen) goto err; If size from qrtr_hdr is 4294967293 (0xfffffffd), the result of ALIGN(size, 4) will be 0. In case of len == hdrlen and size == 4294967293 in header this check won't fail and skb_put_data(skb, data + hdrlen, size); will read out of bound from data, which is hdrlen allocated block.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 194ccc88297ae78d0803adad83c6dcc369787c9e < f8111c0d7ed42ede41a3d0d393b104de0730a8a6, >= 194ccc88297ae78d0803adad83c6dcc369787c9e < 26b8d10703a9be45d6097946b2b4011f7dd2c56f, >= 194ccc88297ae78d0803adad83c6dcc369787c9e < 960b08dd36de1e341e3eb43d1c547513e338f4f8, >= 194ccc88297ae78d0803adad83c6dcc369787c9e < 19892ab9c9d838e2e5a7744d36e4bb8b7c3292fe, >= 194ccc88297ae78d0803adad83c6dcc369787c9e < ad9d24c9429e2159d1e279dc3a83191ccb4daf1d, >= 4.15, >= 4.15 < 4.19.196, >= 4.20 < 5.4.128, >= 5.5 < 5.10.46, >= 5.11 < 5.12.13, 5.13
Fixed versions
4.19.196, 5.4.128, 5.10.46, 5.12.13

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125
CVE-2021-47240 — Linux Linux, linux kernel | SECUFOCUS NOW